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Routing TCP/IP, Volume 1, 2/e by Jennifer Carroll Jeff Doyle

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Chapter 10. Integrated IS-IS

When the terms link-state protocol and IP are mentioned together, almost everyone thinks of Open Shortest Path First (OSPF). Some might say, “Oh, yeah, there’s also IS-IS, but Idunnomuchaboutit.” Only a few will think of Integrated IS-IS as a serious alternative to OSPF. However, those few do exist, and there are networks—primarily ISPs and carriers—that route IP with IS-IS.

IS-IS, which stands for Intermediate System to Intermediate System, is the routing protocol for the ISO’s Connectionless Network Protocol (CLNP). It is described in ISO 10589.[1] The first production incarnation of ...

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